/Engine/Source/Editor/UnrealEd/Public/EditorViewportLayout2x2.h
virtual void ReplaceWidget ( [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [SWidget](API\Runtime\SlateCore\Widgets\SWidget) > OriginalWidget, [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [SWidget](API\Runtime\SlateCore\Widgets\SWidget) > ReplacementWidget )